Bolt-head



(No Model.)

OJPJBALSTON.

BOLT HEAD.

No. 400,161 Patented Mar.- 26, 1889.

UNITED STATES ATENT OFFICE.

OSCAR F. BALSTON, OF BROOKLYN, NEXV YORK.

BOLT-HEAD.

SPECIFICATION forming part of Letters Patent No. 400,161, dated March 26, 1889.

I Application filed August 17, 1888. $erial No. 283,043. (No model.)

To aZZ whom it may concern.-

Be it known that I, OSCAR F. BALSTON, of Brooklyn, county of Kings, and State of New York, have invented an Improvement in Boltlleads, of which the following is a full, clear, and exact description.

My invention relates to an improvement in bolt-heads to obviate the necessity of countersinking the bolt-head and filling the cavity with cement, mastic, or other ingredients to keep out water in guard-rails, ties, stringers, 850., of elevated railroads, bridges, docks, and other structures where timber is exposed to the weather.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is an elevation of my improved screw-bolt head. Fig. 2 is an elevation of my improved lag-screw-bolt head. Fig. 3 is an elevation'of my improved drift bolt head. Fig. 1 is a top View or plan of Fig. 1. Fig. 5 is a top view or plan of Fig. 2. Fig. (5 isatop view or plan of Fig. 3. Fig. 7 is an elevation of the end of bolt of Fig. 1. Fig. 8 is an elevation of the end of lag-screw bolt of Fig. 2, and Fig. 9 is an elevation of the end of drift-bolt, Fig.

Under the head of the bolt A, Fig. 1, the body of the bolt is made larger in diameter, as shown at b, so that when the bolt is driven into the wood the part b will compress the fibers of the timber and form a water-tight joint, al-

5 lowing no water to follow down the bolt-hole,

(which is usually made one-sixteenth of an inch larger in diameter than the bolt,) and as the timber shrinks the compressed fibers will expand and keep the joint tight. A lip or wedge, 0, Figs. 1 and 4, is formed on each side of the bolt near the head, which prevents the bolt turning when the nut d is screwed on with a wrench. Fig. 1 can also be used as a clip or hook-bolt, when part 6 is attached, to fasten ties to wrought-iron flanges of girders. The head of the bolt A, Figs. 1, 2, and 3, is made slightly concave, g, so that the outer rim will set down close on the timber to prevent water running under the head. Fig. 2

' shows my improved lag-screw-bolt head having the same swell I) under the head A and concave g. A square hole, f, Figs. 2 and 5, is made in the head of the bolt A, sufliciently large to insert a wrench to set the bolt down in the timber. Fig. 3 is the same as Fig. 1, with the end, Fig. 9, pointed.

Having thus described my invention, what I claim as new, and desire to secure by. Letters Patent, is

The bolt-head A, having on its under side a part, I), being of a diameter between the diametersof the bolt-head A and the bolt proper, having one or more lips, 0, running from the swelling 1) to the bolt proper, as shown in Figs. 1, 3, 4, and 6, all as described above, and for the purpose set forth.

OSCAR F. BALSTON.

Witnesses:

ANDREW BRYsoN, J OSEPH STRACHAN, JAMES B. KEYES. 

